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Jurors were told that Dunn used a bag of dust and a panel to camouflage the hole where the girl was kept, concealing her from the police on eight or nine occasions.

Judge Briggs said previous reporting was wrong to liken the case to that of Josef Fritzl, the Austrian who kept family members captive, as Dunn’s runaway victim wanted to be hidden from the authorities.

Richard Bennett, prosecuting, said Dunn knew the girl had already been sexually abused by a relative when he raped her, cynically telling her that she had had sex “before so she knew how it felt”.

His kept his two German Shepherd dogs near the hidey hole to put off the police from looking too hard for her, the court heard.

“Paranoid” Dunn imprisoned and raped a second female victim, subjecting her to repeated violence, and filled his house with cameras, locks on the outside of doors and alarms.

Teesside Crown Court (Image: Evening Gazette)

He also groomed and sexually assaulted another vulnerable teenager in the 1990s, giving her alcohol and cigarettes.

She told her mother what happened but when police investigated, Dunn got witnesses to lie and the victim was told her complaint was not going any further.

In a Victim Personal Statement, the complainant said that following Dunn’s conviction, “I know I have been believed and that means so much to me”.

Dunn also raped a girl aged 10 or 11 when he was 19, telling her “this is what boyfriends and girlfriends do” and said she was not to tell anyone.